mineral-database/data/source/minerals/spessartine.yaml at 11e490a3a44ba292c7d61fbb2a6c90ead5ba6464 · gemmology-dev/mineral-database · GitHub

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id: spessartine
name: Spessartine
crystal_system: cubic
point_group: m3m
chemistry: Mn3Al2(SiO4)3
mineral_group: Garnet Group
category: Nesosilicates
hardness: 7-7.5
sg: 4.12-4.20
ri: 1.79-1.82
optical_character: Isotropic
dispersion: 0.027
lustre: Vitreous to resinous
cleavage: None
fracture: Conchoidal to uneven
pleochroism: None (isotropic)
colors:
- Orange
- Reddish-orange
- Yellow-orange
- Mandarin orange
- Red-brown
treatments:
- Generally not treated
inclusions:
- Wavy liquid feathers
- Sugar-like inclusions
- Two-phase inclusions
- Crystal inclusions
- Growth patterns
localities:
- Nigeria
- Namibia
- Mozambique
- Brazil
- Madagascar
- Tanzania
- Sri Lanka
- Myanmar
expressions:
- slug: default
  name: Spessartine
  cdl: |
    #! Species: Spessartine (Garnet)
    #! System: Cubic (m3m)
    #! Habit: Trapezohedron with dodecahedron
    cubic[m3m]:{211}@1.0 + {110}@0.6
  is_primary: true
  form_description: 'Manganese aluminium garnet known for its vibrant orange to reddish-orange colours.
    Fine vivid orange specimens are marketed as "Mandarin" or "Fanta" garnet. Nigerian material is particularly
    prized for its intense orange saturation. Forms a solid solution series with pyrope and almandine.

    '
  forms:
  - trapezohedron
  - dodecahedron